There have been plenty of reports that on Ryzen going from 2400 Mhz up to an extreme overclock of 4000 Mhz (how they got it that high is beyond me) showed a 9% performance improvement in certain benchmarking. As far as I know this has not been tested in audio workloads but if we assume it's true, then it wouldn't even get close to explaining the 150% performance improvement I saw on the 6900K over the 1800x.

Did you miss my post earlier? It's not a 150% improvement.

EDIT: Again for those who missed it;

Frank: "I ran 22 miles today."
Joe: "How long was your last run?"
Frank: "The last one was 18 miles."

Q: How much did Frank improve?
A: He improved 4 miles.
Q: How many percent is that improvement?
A: 22%
Q: How do we know?
A: Because 18 x 0.22 = 4 (3. 96 to be exact).

In contrast: How much is 122% of 18? It is 21.96. And was Frank's improvement 22 miles?